This is quite easy, provided the crafter is comfortable working on circular needles. The hat will fit an average head but can be gently stretched during blocking. The yarn used is called ‘Linen’ by Ice Yarns but is actually 50% linen and 50% viscose. I couldn’t find this exact yarn in the Ravelry database. Ice Yarns says 175 metres or 191.4 yards. I used 3 strands of this light fingering weight yarn - you could try a single strand of a medium weight yarn like worsted/aran, provided the gauge is the same.